No bid has come in for Mo so I wouldn't be worried until one actually does. If it is for 100mil then we need to be worried as they will cash in and it's not like they have a replacement lined up. If they where willing to bring in Mitoma and do what ever it takes to get him then I'd say its a good move but they won't. Losing him could cost us more than its worth imo.
I wouldn't be worried about what other clubs are doing. Why would City or Arsenal sign a ball of players when they don't need to. One wins it every other year and the other just challenged so all they need is tweaking. Manure and Newcastle finished ahead of us as well so it's us that needs to catch up.
Look we have Klopp for 2 seasons and can't be gambling he will sign again. Transition will really start then so it's the same old story of back the manager now while we have someone of that calibre at the helm.